from sys import stdin
input=lambda :stdin.readline()[:-1]

L,R,M=map(int,input().split())
if M<=L:
  print(0)
  exit()
res=1
res2=1
for i in range(1,L):
  res2*=i
  res2%=M
  res*=res2
  res%=M
ans=0
for i in range(L,R+1):
  res2*=i
  res2%=M
  res*=res2
  res%=M
  if res%M==0:
    print(ans)
    exit()
  ans+=res
  ans%=M
print(ans)